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Earnings (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share [Abstract]        
Net income (loss) to common shareholders $ 65.5 $ (13.1) $ 207.3 $ 131.7
Basic weighted average shares outstanding 233.9 238.7 233.8 239.9
Diluted weighted average shares outstanding 235.5 238.7 235.8 244.2
Earnings per common share:        
Basic earnings per share $ 0.28 $ (0.05) $ 0.89 $ 0.55
Diluted earnings per share $ 0.28 $ (0.05) $ 0.88 $ 0.54
Antidilutive securities excluded from computation of earnings per share (in shares) 2.4 8.8 2.8 2.6